k Piscium


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (Vol. I-III)


catalogues and names k Psc, kap Psc, 8 Psc, HR 8911, HD 220825, SAO 128186, FK5: 884, WDS 23269+0115A
constellation Pisces

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)


position, motion, parallax:

position (J2000) RA: 23h 26min 56sec DEC: +1 15' 20''
position (J1900) RA: 23h 21min 48,3sec DEC: +0 42' 29''
proper motion (J2000) RA: 0,089 arcsec/a DEC: -0,097 arcsec/a
radial velocity -3 km/s
note: variable radial velocity
rotational velocity 41 km/s (uncertain) (variable)
trigonometric parallax 0,04 arcsec

magnitude

visual magnitude 4,94
(V on UBV Johnson system)

spectral / color information

spectral class A0pCrSi:Sr:
B-V-magnitude 0,03
U-B-magnitude -0,02
R-I-magnitude -0,03
note (category: spectra): Oxygen deficient relative to magnesium. Many uranium lines; possibly the uncommon element holmium. Uranium and osmium may be due to supernova explosion in a nearby star.

variability information

variable star identification Kap Psc
note (category: variability): Alpha CV 4.91 - 4.96V, 0.58525:d. Period changes? Magnetic and spectrum variable, 0.5805d.

double/multiple star system information

number of components of multiple star system 3
separation 163,4 arcsec
mag difference (of double or brightest multiple) 7
component ID AB
note Worley (1978) update of the IDS
note (category: double and multiple data): AB optical. Component A suspected occultation double.

miscellaneous information

note (category: group membership): Member of Pleiades group.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 23h 26min 55,957sec DEC: +1 15' 20,07'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0059 arcsec/a DEC: -0,097 arcsec/a source: 25
radial velocity -3 km/s source: 25
trigonometric parallax 0,04 0,004 arcsec source: 25
galactic coord. (B1950) longitude: 83,93 latitude: -55,08
GCI unit vector (J2000) X: 0,989372 Y: -0,143749 Z: 0,021912

magnitude:

visual 4,9 (observed) source: 31
photovisual 4,9 source: 2

spectral information:

spectral class A2 source: 96
Morgan-Keenan A0pCrSi:Sr: source: 25
B-magnitude 4,97 0,05 B-V-magnitude 0,03
U-magnitude 4,95 0,05 U-B-magnitude -0,02

variability information:

source of data: 30
variability type 160
var. amplitude 0,08
var. period 0,59

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 163,4 arcsec
magnitude difference between brightest and second brightest component 7
position angle 344

sources:

2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15 FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 23h 24min 22,087sec DEC: +0 58' 53,91'' 0,004 arcsec
position (J2000) RA: 23h 26min 55,954sec DEC: +1 15' 20,04''
proper motion J1950 (FK4) RA: 0,0057 arcsec/a DEC: -0,092 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0059 arcsec/a DEC: -0,097 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A2p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 884
Durchmusterung BD+00 4998
Boss General Catalogue 32620
Henry Draper Catalogue 220825

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 23h 26,9min DEC: +1 15'
proper motion (J2000) RA: 0,089 arcsec/a DEC: -0,097 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
AB 1824 9 345 150,1'' 4,94 11,9 - S 830
1921 344 163,4''
BC 1907 1 154 76,1'' 11,9 13,1 - S 830

discoverer information:

discoverer code discoverer reference
S 830 South, J. -

notes:

note Kappa Psc. An optical pair. Spectrum A0pCrSi:Sr:.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (J1950) RA: 23h 24min 22,1sec DEC: +0 58' 54''

variability informations:

variability type ACV rotating variable star
magnitute at max. brightness 4,87
magnitute at min. brightness 4,95
photometric system visual, photovisual or Johnson's V
period [d] 0,58525 (uncertain)

spectral information

spectral class A0p(Cr-Sr-Si-Eu)

references

to a study Vol. III GCVS
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue 66/9010
constellation Piscis Austrinus
notes on existence The star is equivalent to '0670001 R'.

variability type description

variability type description
ACV Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields.
Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V.

ACVO
Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.